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Opinion

Caerphilly earthquake turns Welsh politics on its head

28 Oct 2025 5 minute read
Reform representatives at the result was announced at Caerphilly Leisure Centre

Jonathan Edwards

The Caerphilly by-election confirmed what the opinion polls have been saying for many months, that Welsh politics is at a transformative moment.

This time last year I wrote a speculative article for Nation.Cymru proclaiming that Welsh politics could easily polarise along these lines, leaving the two traditional main parties that have dominated Welsh and UK politics facing an existential crisis.

As the dust settles on the result it is clear the nation’s politics is polarising between Plaid Cymru and Reform, with Labour and the Tories now in extremely vulnerable positions.

In other articles at the beginning of the year on the strategic choices facing Plaid and Labour, I advocated that both had to polarise against Reform.

Health warning

What made sense for both parties on an individual basis did come with one major health warning: if both parties pursued the same strategy, there was a danger that they would neutralise each other to the gain of Reform.

Therefore, what made sense individually for Labour and Plaid Cymru was collectively perilous. To prove I am no know-it-all, I was convinced earlier this week that this would be the outcome of the by-election.

On Thursday however the Labour vote dramatically collapsed, coalescing around Lindsay Whittle to deliver one of the most famous election victories in the history of Plaid Cymru. On a personal note, I am delighted for him after his decades of graft in the constituency. I thought his speech that the result should be noticed in London and Cardiff was spot on.

The Plaid leadership would do well to understand that the insurgency in Welsh politics is against both capitals. Whether the party can credibly portray itself as a Senedd insurgent force in a national election is a big question.

Anti-Reform vote

Looking forward to May, I suspect the result will very much depend on whether the anti-Reform vote coalesces around one party or fragments. I suspect the new Senedd voting system may make it harder for voters to understand how to vote tactically when compared to a first past the post by-election, and surely Labour in a national campaign, in a battle for its very survival, won’t wilt like they did in Caerphilly.

While the by-election offers temporary relief, it would be beyond complacent to determine that the Reform threat is dealt with. Let no one be under any illusion: the real battle has yet to begin.

For Labour the result was a disaster. The party in Wales looks out on their feet, not helped by the wider UK party that treats its most loyal fiefdom as an afterthought. It appears that the locals are finally rebelling, and the ruling Labour political class in Wales is in a state of political paralysis. Is it too late to turn matters around? Probably.

However, if Keir Starmer is reading, here’s the beginning of a plan that might save his bacon. Introduce an emergency Government of Wales Act to equalise powers with Scotland and deal with national grievances such as HS2 and the Crown Estates.

Announce a Welsh Marshall plan with a dedicated long-term capital investment fund. Declare that the Union will be reformed so that constituent countries will have equal status on pan-UK bodies.

Do anything that shows that Labour cares for Wales. Pork barrel politics it is; however, people have long given up on the idea that the structures of the British State can deliver for Wales. Failure to act and the firestorm in Wales could very soon consume his own Premiership.

No 10 is not going to be able to cauterise a humiliation in Wales in May. Mr Starmer’s fate is very much intertwined with his party’s Senedd campaign.

Taken for granted

For Reform, the election result should be an awakening that politics should never be taken for granted.

It fought the election on a wave of arrogance thinking that it would win merely by filing the nomination papers on time. The Nigel Farage show is the party’s greatest strength, but it is going to need far more substance come May on its policy offer.

It is also going to have to find articulate candidates. Some of the interviews during the campaign were beyond awful with spokespeople not able to articulate a single policy commitment or in some cases a sentence. Does Caerphilly signal the moment when the wheels come off the cart for Reform in Wales? Time will tell.

Plaid Cymru will be hoping that there isn’t a complete collapse. The rise of an ultra-British nationalist right wing populist force has given Plaid a raison d’etre.

In the laws of political physics, the emergence of Reform has led to a counterbalance reaction in our country placing turbo charges under Plaid in the same way Brexit did for Welsh independence.

Threat

This might be difficult reading for some in Welsh nationalist circles, but they need Reform to remain a potent threat.

The by-election victory puts the party on course to win in May, a strategic must. Coming second and forming a government backed by Labour isn’t sufficient.

As First Minister, Rhun ap Iorwerth will face a hostile political landscape, paralysed at home due to a lack of a majority with a UK Government undermining his every step. He will need the moral authority of leading the largest party to give him any hope.

Can Plaid Cymru deliver?

Winning Caerphilly will count for nothing if the result isn’t replicated next May.

Jonathan Edwards was the MP for Carmarthen East and Dinefwr 2010 to 2024


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andy w
andy w
1 month ago

I don’t disagree that Wales needs equal funding to England; but even with the best infrastructure in the world, what is the point of getting quicker around Wales if there are no extra well-paid jobs? Rachel Reeves has zero interest in UK Universities https://www.gov.uk/government/news/leading-lights-of-uk-research-spearhead-search-for-worlds-best-talent#:~:text=Imperial%20College%20London%20is%20a%20global%20university,of%20society%20%2D%20from%20tackling%20malaria%20to will infuriate academics as well-paid research roles will be given to non-UK academics. So Wales universities who are already loss making will suffer industrial relations issues / lowering staff morale. Hundreds of academics will travel to UK, have high grant funding then return home with new skills – in Wales the only University involved is Cardiff.… Read more »

Buzby
Buzby
1 month ago
Reply to  andy w

Wales needs equitable funding, not equal funding. With the UK economy centred on London, regions and nations are increasingly disadvantaged the further away they are from the economic centre, because fewer people can take advantage of the wealth and opportunity hoarded in the capital, and the less inclined London investors are to write cheques for proposals they can’t visit in an hour or two from the UK capital.

Whitehall can either acknowledge and compensate for this properly or rethink the failed “one economic engine” model so all the regions and nations are punching above their weight.

Steve D.
Steve D.
1 month ago

Reform will regroup. Plaid can not rest on it’s laurels. As the May election draws near people will begin to coalesce around either progressive Plaid or divisive Reform. Battlelines are forming after Plaid won the first battle. The soul and existence of Cymru is at stake. Over dramatic? Most definitely.

Amir
Amir
1 month ago
Reply to  Steve D.

No, not over dramatic. With deform, Cymru would be erased

Richard Lice
Richard Lice
1 month ago

The D’Hondt formula is a bit of a game changer when there are 6 seats up for grabs in each constituency Nobody quite understands it when they get down to choosing the 5th or 6th candidate You need a PhD in Maths . Every vote counts The latest Yougov survey yesterday shows a massive upsurge in support for the Greens to 25% nationwide for the 18-48 group Doubtful that would be replicated in Wales but nevertheless significant Greens forecasted to get 2 seats That could easily become 4 or more When the margin is forecasted to be wafer thin between… Read more »

CapM
CapM
1 month ago
Reply to  Richard Lice

‘Nobody quite understands it when they get down to choosing the 5th or 6th candidate’ With the new system voters only get one vote. They can only use it to vote for a party. Voters could use their vote to vote for a party that isn’t their first choice if they really didn’t like the candidate their first choice party had put first on their list of candidates [or maybe others further down the list] but then risk candidates of parties they really disagree with getting elected. Playing the system is possible but getting the result you are playing for… Read more »

Last edited 1 month ago by CapM
J jones
J jones
1 month ago

Looking ahead I think we’d actually be better served moving away from the ‘two horse race’ political strategy. I agree it makes perfect rational sense in FPTP to Plaids great benefit, but is not such a good fit for multi member list. In a system that is no longer winner takes all then a lot will depend on how the vote is shared out and you may get a better spread from it being shared out. For instance if the same result as happened in Caerphilly played out in a six member seat then the result would be 3-3 for… Read more »

David J
David J
1 month ago

I disagree that Plaid “needs” Reform, in order to mobilise the Nationalist vote. Over the years, the English establishment, whether Labour or Tory, has done plenty to show the Cymry that independence is their best hope for a fairer, more prosperous society. If the HS2 and Crown Estate ripoffs aren’t enough to persuade you, then nothing will.

Crwtyddol
Crwtyddol
1 month ago

Wales has fallen out of love with Labour.
What’s left? Apart from Plaid, the cupboard is bare. However , in that circumstance, major apathy lurks in the wings, waiting to pounce, figuratively speaking. If that happens, God help

James Edwards
James Edwards
1 month ago

The lazy reporting by the English media on Caerphilly is both inaccurate and predictable. Fifty percent of young people in Wales now say they support Plaid that is absolutely massive. Very few people in Caerphilly or anywhere else are lending their votes to Plaid they are sick and tired of Welsh Labour and won’t be going back in May and in the case of the young they’ll be voting Plaid in big numbers in May and the ones that don’t will be voting a mix of Reform and the Greens. Very few will vote either Labour or the Tories

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